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[gbh]

Just took the old car around the block a mile or so and thought i'll check the air con which has never worked as i never really used it.Anyway to the point lifted the bonnet and front fans not working but i also noted that the heating pipes which pass by the expansion bottle were still cool,the climate control was off on the drive and i set it to LO as i parked up when set to Hi it started to warm up straight away.Apart from the fans working or not working is this correct? Why i ask is that my other Omega has or had a HBV problem so i changed it but with climate control OFF those same heating pipes start to get warm and when set to LO they are still getting hot with time and water is dripping from the evaporator drain pipes.Could it be a problem with the climate control vacuum in some way?

[gbh]

With ECO on stops the engine fans, stops the drip and the heating inside just got a lot warmer!!

[Doctor Gollum]

With ECO on stops the engine fans, stops the drip and the heating inside just got a lot warmer!!

The Aircon in this vehicle is working correctly

[gbh]

Matrix pipes still cool on one and not the other under same conditions?

[Doctor Gollum]

Aircon and heater matrix are connected by air and electricity... Heater not working regardless of setting is either a failed Hbv(vacuum issue, not coolant) or a blocked matrix...

If this is the car with idle issues, I would be looking at a vac leak in the heater vacuum system.

[Doctor Gollum]

Aircon and heater matrix are connected by air and electricity... Heater not working regardless of setting is either a failed Hbv(vacuum issue, not coolant) or a blocked matrix...

If this is the car with idle issues, I would be looking at a vac leak in the heater vacuum system.

Ignore the last bit... different person/car altogether

[gbh]

Hi let me explain again,after driving around with the heating off or on LO the pipe off the HBV that passes by the coolent expansion bottle is not warm on HI the heating works fine.But those same pipes on the other car get hot whether off or on LO!! So different in operation.Does the HBV let hot water through if the climate control is OFF or on LO ?

[Doctor Gollum]

You mean the pipes that run to/from the pump below the expansion tank?

[gbh]

Yes

[Doctor Gollum]

On the car with hot pipes does unplugging that pump make any difference?

Note, it should only run if climate panel is activated with engine off, as per manual.


If not, suspect either a vac issue with the hbv control, or an internally failed hbv... one of them might also be plumbed in wrong, but don't have one to hand to cross check for you

[gbh]

Its a brand new HBV and GM! The one previous behaved the same before it gave up! With aircon on LO quite a lot of drips from evaporator drains,maybe because heater matrix is clashing with aircon. With aircon off or climate to HI no drip and much hotter inside!!

[Doctor Gollum]

Its a brand new HBV and GM! The one previous behaved the same before it gave up! With aircon on LO quite a lot of drips from evaporator drains,maybe because heater matrix is clashing with aircon. With aircon off or climate to HI no drip and much hotter inside!!

Drip is normal aircon operation. On this car it works.

Heating/coolant flow is a separate thing altogether.

If hbv is new then the plumbing on one of the cars is wrong, but without a third, known correct car for comparison there's no way to tell from here.

[gbh]

Have just checked differences cold pipe car still cold after short run and noticed small pipe from expansion bottle to Throttle is warm/getting hot.Hot pipe car removed electrical connection and HBV vacuum pipe with climate off pipes getting HOT but small pipe to throttle cold!!

[Doctor Gollum]

Keep the vacuum pipe connected.

That throttle coolant pipe should have coolant running through it, so if upto temperature it should have heat in it... that said, I have never checked it for temperature,  so it could be that the air through the throttle bodies is enough to cool it down, although temperature is currently +17° not -17° so throttle icing that it's there to prevent shouldn't be a problem anyways

[gbh]

Have just read another thread and this is what it said.....you are correct no vacuum = heat. no vacuum to the hbv could be faulty solenoid.(common problem) little brown thing behind glovebox bolted to heater box. there are 2. other one with black/blue pipe opens closes recirc flap. they are interchangeable. swop them see what you get